# Python pass语句及其作用
age = int(input("请输入你的年龄："))

if age < 12:
    print("婴幼儿")
elif 12 <= age < 18:
    print("青少年")
elif 18 <= age < 30:
    print("成年人")
elif 30 <= age < 50:
    pass
else:
    print("老年人")
